The UTG Super Slim Flip-up Rear Sight features a tool free windage adjustment wheel, dual aiming apertures, and is precision machined from matte black anodized aircraft aluminum. Its low profile mounting base securely attaches to any Picatinny rail. Our Posi-lock retention design prevents the sight tower from collapsing when the sight is flipped up and in use; designed to match our Super Slim Flip-up Front Sight, MNT-755.